Alert archive / Montana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 21, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jul 1, 2001, 4:06 AM MDT for Pondera County, Montana. It was in force for 24 min. 1 report came from inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.
The facts
- Issued
- Jul 1, 2001, 4:06 AM MDT (10:06 UTC)
- Expired
- Jul 1, 2001, 4:30 AM MDT
- In force
- 24 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Pondera County, MT
The radar
The Great Falls radar (KTFX), 109 km from the middle of the area, began a volume at 10:06 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 1, 4:12 AM MDT | Thunderstorm Wind 52 E | Valier, MT | Reported by spotter in Valier. |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Great_falls, MT (KTFX), launched 00:00Z, 10.1 hours before the alert went out and 150 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 63 J/kg
- Mixed-layer CIN
- -165 J/kg
- Mixed-layer LCL
- 1726 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 312 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS55 KTFX 011007 SVRGTF MTC073-011030- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT 406 AM MDT SUN JUL 1 2001 THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL PONDERA COUNTY IN NORTH CENTRAL MONTANA THIS INCLUDES THE CITY OF CONRAD * UNTIL 430 AM MDT * AT 404 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 7 MILES SOUTHWEST OF VALIER...OR ABOUT 20 MILES WEST OF CONRAD...MOVING EAST AT 40 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... 4 MILES NORTH OF CONRAD AT 430 AM MDT REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGEN'CY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN GREAT FALLS. LAT...LON 4835 11252 4816 11237 4815 11178 4832 11189
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 1, 3:00 AM MDT | Severe Thunderstorm Warning | TFX | Glacier, Pondera | 30 min |
| Jul 1, 4:34 AM MDT | Severe Thunderstorm Warning | TFX | Pondera, Toole | 41 min |
| Jul 1, 7:49 AM MDT | Severe Thunderstorm Warning | TFX | Blaine | 26 min |
Nearby
Severe Thunderstorm Warnings in Montana, 2001Every severe thunderstorm warning in 2001
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.